82 lines
2.6 KiB
Dart
82 lines
2.6 KiB
Dart
import 'package:aves/model/entry/entry.dart';
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import 'package:aves/model/view_state.dart';
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import 'package:aves/widgets/viewer/view/controller.dart';
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import 'package:aves_magnifier/aves_magnifier.dart';
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import 'package:collection/collection.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/rendering.dart';
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class ViewStateConductor {
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final List<ViewStateController> _controllers = [];
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Size _viewportSize = Size.zero;
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static const maxControllerCount = 3;
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ViewStateConductor() {
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if (kFlutterMemoryAllocationsEnabled) {
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FlutterMemoryAllocations.instance.dispatchObjectCreated(
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library: 'aves',
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className: '$ViewStateConductor',
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object: this,
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);
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}
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}
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Future<void> dispose() async {
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if (kFlutterMemoryAllocationsEnabled) {
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FlutterMemoryAllocations.instance.dispatchObjectDisposed(object: this);
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}
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_controllers.forEach((v) => v.dispose());
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_controllers.clear();
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}
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set viewportSize(Size size) => _viewportSize = size;
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ViewStateController getOrCreateController(AvesEntry entry) {
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var controller = getController(entry);
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if (controller != null) {
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_controllers.remove(controller);
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} else {
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// try to initialize the view state to match magnifier initial state
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const initialScale = ScaleLevel(ref: ScaleReference.contained);
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final initialValue = ViewState(
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position: Offset.zero,
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scale: ScaleBoundaries(
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allowOriginalScaleBeyondRange: true,
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minScale: initialScale,
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maxScale: initialScale,
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initialScale: initialScale,
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viewportSize: _viewportSize,
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contentSize: entry.displaySize,
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).initialScale,
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viewportSize: _viewportSize,
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contentSize: entry.displaySize,
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);
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controller = ViewStateController(
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entry: entry,
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viewStateNotifier: ValueNotifier<ViewState>(initialValue),
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);
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}
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_controllers.insert(0, controller);
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while (_controllers.length > maxControllerCount) {
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_controllers.removeLast().dispose();
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}
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return controller;
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}
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ViewStateController? getController(AvesEntry entry) {
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return _controllers.firstWhereOrNull((c) => c.entry.uri == entry.uri && c.entry.pageId == entry.pageId);
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}
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void reset(AvesEntry entry) {
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final uris = <AvesEntry>{
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entry,
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...?entry.burstEntries,
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}.map((v) => v.uri).toSet();
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final entryControllers = _controllers.where((v) => uris.contains(v.entry.uri)).toSet();
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entryControllers.forEach((controller) {
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_controllers.remove(controller);
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controller.dispose();
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});
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}
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}
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